Save Gender Feminine Usage English (Modern) Pronounced Pron. KAY-lin [key] Other Forms FormsKaylyn, Kalyn, Kaylin, Kaylynn, Cailin, Cailyn, Kailyn and other spellings, Kailyn, Caylyn, Kaitlyn, Caitlin Meaning & History Anglicized form of Caoilfhionn.